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ABSTRACT

AN ALARM REPORTING TELEPHONE IN WHCH THE CLOSURE OF ANY ONE OF A PLURALITY OF ALARM RESPONSIVE SWITCHES INITIATES THE OPERATION OF A TAPE DECK THAT SELECTIVELY PLAYS ONE OF FOUR TRACKS RECORDED ON AN ENDLESS LOOP OF TAPE. EACH TRACK HAS INFORMATION RECORDED THEREON IN THE FORM OF MULTIFREQUENCY TONE BURSTS AND/OR VERBAL STATEMENTS. THE MULTIFREQUENCY TONE BURSTS ARE CONVERTED INTO CORRESSPONDING SWITCH CLOSURES BY A MULTIFREQUENCY SIGNAL RECEIVER TO INTERRUPT A TETLEPHONE LINE SO AS TO TRANSMIT PULSES THEREOVER CORRESPONDING TOA PREDETERMINED TELEPHONE NUMBER, TO CAUSE THE TAPE DECK TO SWITCH FROM ONE TAPE TRACK TO ANOTHER, AND TO RESET THERMAL TIMERS. THE VERBAL STATEMENTS ARE TRANSMITTED OUT ON THE TELEPHONE LINE TO   THE CALLED STATION WHICH EXERCISES CONTROL OVER THE REPORTING TELEPHONE BY THE TRANSMISSION THERETO OF THREE DIFFERENT MULTIFREQUENCY TONES. ONE OF THE THREE MULTIFREQUENCY TONES INITIATES THE OPERATION OF EQUIPMENT FOR CORRECTING THE ALARM CONDITION, WHILE A SECOND MULTIFREQUENCY TONE INITIATES THE SHUTTING DOWN OF THE REPORTING TELEPHONE.

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NOk TQ LG, Wk MOM a A Q? Q n h United States Patent O 27,782 TELEPHONEREPORTING SET Raymond James Andrews, San Diego, Gary Conway Fields,Oakland, and Harold Kirkwood Thompson, San Anselmo, Calif., assignors toAmerican Telephone and Telegraph Company, New York, N.Y.

Original No. 3,531,597, dated Sept. 29, 197|), Ser. No. 614,310, Feb. 6,1967. Application for reissue Jan. 11, 1971, Ser. No. 105,229

Int. Cl. H04m 11/04 U.S. Cl. 179-5 P 14 Claims Matter enclosed in heavybrackets [I appears in the original patent but forms no part of thisreissue specilication; matter printed in italics indicates the additionsmade by reissue.

ABSTRACT F THE DISCLOSURE An alarm reporting telephone in which theclosure of any one of a plurality of alarm responsive switches initiatesthe operation of a tape deck that selectively plays one of four tracksrecorded on an endless loop of tape. Each track has information recordedthereon in the form of multifrequency tonei bursts and/or verbalstatements. The multifrequency tone bursts are converted intocorresponding switch closures by a multifrequency signal receiver tointerrupt a telephone line so as to transmit pulses thereovercorresponding to a predetermined telephone number, to cause the tapedeck to switch from one tape track to another, and to reset thermaltimers. The `verbal statements are transmitted out on the telephone lineto the called station which exercises control over the reportingtelephone by the transmission thereto of three different multifrequencytones. One of the three multifrequency tones initiates the operation ofequipment for correcting the alarm condition, while a secondmultifrequency tone initiates the shutting down of the reportingtelephone.

FIELD OF THE INVENTION This invention relates to the field of telephonecommunications and within that field to the area of alarm reporting overtelephone circuits.

Telephone reporting sets have been developed for surveillance atunattended customer locations. These reporting sets are used to performsurveillance of the unattended premises themselves, such as for tire orburglary, or to perform surveillance of equipment located at theunattended premises, such as for ineffective operation or failure of theequipment. The surveillance is carried out by monitoring the premises orequipment for the occurrence of particular preselected conditions,hereinafter referred to as alarm conditions. When such a conditionoccurs, the reporting set responds by calling a supervisory station andinforming the supervisory station of the source of the call and theoccurrence of the condition.

DESCRIPTION OF THE PRIOR ART Heretofore the monitoring capability ofreporting sets has been quite limited, most sets responding to theoccurrence of only a single alarm condition, or Where responding to morethan one condition being unable to identify which particular conditionhas in fact occurred. Only a few reporting sets have the capability ofresponding to as many as three different conditions and identifying themindividually to the supervisory station.

Furthermore, only the reporting set disclosed in the copendingapplication of I. F. Ritchey-L. D. Tate-R. E. Waddell, Ser. No. 554,431,led June 1, 1966, includes means for permitting the supervisory stationto activate subscriber owned equipment that may take corrective actionwith respect to the alarm condition that has occurred.

Re. 27,782 Reissued Oct. 9, 1973 ICC In that reporting set, however, itis necessary for the supervisory station to call the reporting set inorder to initiate the operation of this equipment. The operation cannotbe initiated at the time that the reporting set lirst calls thesupervisory station to inform it of the occurrence of the condition.

SUMMARY OF THE INVENTION A reporting set is herein disclosed that iscapable of monitoring a multiplicity of alarm conditions and when one ormore of the conditions do occur being able to identify to thesupervisory station specifically what they are.

In addition, a reporting set is herein disclosed that is capable ofinitiating the operation of subscriber owned equipment responsive to acommand signal transmitted by the supervisory station at the time thatthe supervisory station is being informed of the alarm conditions thathave occurred.

The reporting set of the present invention monitors up to sixteendifferent alarm conditions. When one or more of the conditions occur,the reporting set seizes the telephone line it is connected to and uponplacement of dial tone on the line, the reporting set dials thetelephone number of the supervisory station. Then for a period of timefollowing the completion of the dialing the reporting set repetitivelytransmits a recorded message identifying itself.

Upon answering the call from the reporting set, the supervisory stationexercises control over the reporting set by three different commandsignals. These command signals are identified as report, repair, anddisable.

The report command signal is transmitted first, and it causes thereporting set to terminate the transmission of the stationidentification and initiate the transmission of an alarm report. Thealarm report informs the supervisory station which alarm conditionsamong those being monitored have actually occurred.

The repair command signal is transmitted after the alarm report has beenheard, and it initiates the operation of subscriber equipment that maytake corrective action with respect to the alarm conditions that haveoccurred. If the corrective action is partially successful, thereporting set announces only those conditions that continue to exist. Ifthe corrective action is completely successful, the reporting setinforms the supervisory station of this fact and then drops thetelephone line and restores to a standby state.

The disable command signal is transmitted last, and it is used when thecorrective action taken responsive to the repair command signal is notcompletely successful. In response to the disable command signal, thereporting set shuts down and ceases to respond to the existing alarmconditions or to the occurrence of any additional alarm conditions.

The reporting set automatically drops the telephone line and initiatesanother call after a preselected interval of time elapses during thetransmission of the station identiiication without the reporting setreceiving a report command signal. The same sequence occurs if apreselected interval of time elapses during the transmission of thealarm report without the reporting set receiving a report or repaircommand signal. This assures that the supervisory station does in facthave the opportunity to be informed of the alarm conditions causing thereporting set to respond.

BRIEF DESCRIPTION 0F THE DRAWINGS FIG. 1 is a block diagram illustratingthe cooperation between various functional circuits of the telephonereporting set of this invention.

FIGS. 2A and 2B show the alarm detection circuit;

FIG. 3 shows the information storage and accessing circuit;

FIG. 3A shows an illustrative tape recording arrangement;

FIG. 4 shows the line circuit;

FIGS. 5A, 5B, and 5C show the control circuit;

FIG. 6 shows the timing circuit;

FIG. 7 shows the repair circuit; and

FIGS. 8A and 8B show how FIGS. 2A, 2B, 3, 4, 5A, and 5B should be placedwith respect to one another to provide an operative arrangement.

The schematic circuit diagrams employ a type of notation referred to asdetached contact in which an x represents a normally open contact of arelay and a vertical bar represents a normally closed contact of arelay. Normally refers to the deenergized condition of a relay and ofcourse a contact changes state when the relay with which it isassociated is energized. The principles of this type of notation aredescribed in an article entitled An Improved Detached Contact Type ofCircuit Drawing by F. T. Meyer in the September 1955 publication of theAmerican Institute of Electrical Engineers Transactions, Communicationsand Electronics, volume 74, pages 505-513.

In addition, functional designations have generally been used for thenames of the various components, the referenec characters associatedwith the schematic rcpresentation of the components being abbreviationsof these functional designations. For example, the alarm relaysappearing in FIG. 2A have the reference characters ALI and AL2. The samereference characters followed by a subscription are used to designatethe contacts of the relays, each contact of a relay having its ownindividual subscript.

DESCRDPI'ION OF THE ILLUSTRATIVE EMBODIMENT Referring to the blockdiagram in FIG. l, the telephone reporting set of the present inventionmay be arranged in six functional circuits. These circuits consist of analarm detection circuit (FIGS. 2A and 2B), an information storage andaccessing circuit (FIG. 3), a line circuit (FIG. 4), a control circuit(FIGS. 5A, 5B and 5C), a timing circuit (FIG. 6), and a repair circuit(FIG. 7). The interaction between these circuits is represented by thearrows extending between the blocks of the diagram.

The alarm detection circuit shown in FIGS. 2A and 2B operates inconjunction with certain sensing apparatus of the subscriber. Thisapparatus comprises means for monitoring the premises or equipment ofthe subscriber for the occurrence of the alarm conditions the subscriberis interested in detecting and a plurality of normally open alarmswitches that are actuated by the monitoring means. Each alarm switch isassociated with an individual alarm condition and is closed by themonitoring means upon the occurrence of the alarm condition with whichit is associated. Furthermore, each alarm switch either closes when thecondition occurs and reopens when it stops, or it is latched closed whenthe condition occurs and is only unlatched responsive to a particularsignal from a supervisory station.

The present embodiment includes sixteen of these alarm switches and istherefore capable of monitoring up to sixteen different conditions. Thealarm switches are of the latching variety and are identified as AS1through ASB and AS11 through ASIS. As shown in FIG. 2A, the the alarmswitches are divided into two groups, the switches AS1 through ASS beingin one group and the switches AS11 through A518 being in the secondgroup.

The alarm detection circuit further includes an alarm relay ALI that isassociated with the rst group of alarm switches AS1 through ASS and analarm relay ALZ that is associated with the second group of alarmswitches AS11 through ASIS. Finally, the alarm detection circuitincludes a stepping chain of relays SCI through SC10 that in combinationwith a steering relay SR, a group transfer relay GT and the alarmswitches AS control the operation of an alarm gate relay AG. The alarmgate relay AG, in turn, exercise control over the information storageand accessing circuit during the alarm reporting period.

The information storage and accessing circuit shown in FIG. 3, includesa tape deck TD having four heads HD1 through HD4, a drive motor DM, anda drive solenoid DS. The heads HD1 through HD4 each scan one quarter ofthe width of the tape. The drive motor DM when energizer rotates a tapecapstan (not shown) while the drive solenoid when energized actuates apressure roller (not shown) to press the tape against the capstan. Thus,movement of the tape past the heads HD1 through HD4 does not occur untilboth the drive motor DM and the drive solenoid DS are energized.Energization of the drive motor DM is under the control of a motor relayM. A suitable commercial tape deck is marketed by Viking of Minneapolisas Viking Model 38QQ.

The tape deck TD operates in conjunction with a continuous loop of tapeadvantageously contained in a tape cartridge. The loop of tape is of alength such that one complete traversal of the tape takes 30 seconds.Four tracks are recorded on the tape, and FIG. 3A shows the manner inwhich the four tracks are utilized.

The first track of the tape, referred to as the dial track, has thetelephone number of a supervisory station recorded thereon in the formof repetitive tone bursts of a particular pair of frequencies. The pairof frequencies used are those generated by a Touch-Tone dial when the 9button is depressed, i.e., 1209 and 852, and as employed in the dialtrack this multifrequency signal will be referred to as a pulse tone. Ashereinafter described, during the time that the dial track is beingplayed back, the pulse tone bursts are converted into dial pulses on aone to one basis. Thus each digit comprises a series of pulse tonebursts corresponding in number to the value of the digit.

The last digit of the telephone number is followed by a tone burst of adifferent pair of frequencies, this pair of frequencies being thatgenerated by a Touch-Tone dial when the 0 button is depressed, i.e.,1336 and 941. This multifrequency signal, hereinafter referred to as atrack end tone, serves to indicate whether the tape is being properlyscanned by the heads. Once the deck motor DM and the deck solenoid DShave both been energized, the absence of this signal for a particularperiod of time results in the shutting down of the reporting set. Thus,a track end tone burst is also recorded at the end of each of the otherthree tracks.

The second track of the tape, referred to as the identication track, hasa repetitive announcement recorded thereon identifying the reporting setto the supervisory station. Where the reporting set calls thesupervisory station through a central ofce having centralized automaticmessage accounting, the reporting set must also identify itself bytelephone number to a telephone operator. As indicated by theillustrative announcement in FIG. 3A, for the purposes of the presentdisclosure, it will be assumed that the reporting set is employed at apower substation.

The third and fourth tracks of the tape, referred to as the reporttracks, are each divided into ten time slots of three seconds each. Eachtime slot has a multifrequency tone burst recorded at the beginningthereof that has the same frequencies as the pulse tone, but as used inthe report tracks, this signal will be referred to as a time slot tone.Each time slot tone is followed by a particular announcement. The firsteight time slots of each track have announcements reporting theoccurrence of the individual conditions being monitored, the first eighttime slots of track 3 respectively corresponding to the alarm conditionsassociated with the rst group of alarm 5 switches AS1 through ASS andthe first eight time slots of track 4 respectively corresponding to thealarm conditions associated with the second group f alarm switches ASllthrough A518. The ninth time slot of both tracks has an end of reportannouncement, while the tenth time slot of both tracks has anannouncement indicating successful correction of the conditions thathave occurred.

As indicated by the illustrative announcements in FIG. 3A, in thepresent embodiment it will be assumed that the reporting set monitorssixteen normally closed circuit breakers, the circuit breakers beingnumbered one through eight and eleven through eighteen to correspond tothe alarm switches AS. The opening of any of the circuit breakersresults in the closing of the alarm switch AS associated therewith, thealarm switches reopening upon the reclosure of the circuit breakers.

Referring again to FIG. 3, the heads HD1 through HD4 are respectivelyconnected to a preamplifier PA under the control of head relays H1through H4, only one head being connected to the preamplifier at anytime. The output of the preamplifier PA is coupled through a transformerTR to both a tape to line amplifier TL and a tape to control amplifierTC. The tape to line amplifier TL is connected to the line circuit whilethe tape to control amplifier TC is connected to the control circuit.

The line circuit, shown in FIG. 4, includes a pair of line conductorsthat are connected to the ring and tip conductors of a ground starttelephone line. A telephone set TS is connectable across the lineconductors by the manual operation of an exclusion switch EX. Inaddition, a direct current pulsing path including a normally closedcontact P, is connectable across the line conductors by the operation ofa start relay ST of the control circuit. Finally, a direct currentterminating path comprising an inductor L1 and an alternating currentcoupling path comprising a 2-wire-4-wire hybrid coil HC are connectableacross the line conductors by the operation of a station identificationrelay SI of the control circuit.

The line conductors in combination with the hybrid coil HC serve toconnect the information storage and accessing circuit to the telephoneline so that information may be transmitted out on the line to thesupervisory station. It also serves in combination with a line tocontrol amplifier LC to connect the supervisory station to the controlcircuit so that command signals transmitted by the supervisory stationcan direct the operation of the reporting set.

Three command signals are employed in the present embodiment, and eachcomprises a multifrequency tone of a particular pair of frequencies. Thefirst command signal, identified as the report command signal, comprisesthe pair of frequencies generated by a Touch-Tone dial when the 1 buttonis depressed, i.e., 1477 and 697. The second command signal, identifiedas the repair command signal, comprises the pair of frequenciesgenerated by a Touch-Tone dial when the 2 button is depressed, i.e., 136and 697, and the third command signal, identified as the disable commandsignal, comprises the pair of frequencies generated by a Touch-Tone dialwhen the 3 button is depressed, i.e., 1209 and 697. The supervisorystation is advantageously equipped with a Touch-T one telephone andtherefore can employ the dial thereof to generate these command signals.

The control circuit, shown in FIGS. 5A, 5B, and 5C includes amultifrequency signal receiver MFR that receives the multifrequencytones transmitted by the information storage and accessing circuit 22and the multifrequency tones transmitted by the supervisory station overthe telephone line and amplified by the line circuit 24. As mentionedabove, these multifrequency tones are those generated by a Touch-Tonedial upon the operation of the pushbuttons thereof. Consequently, as setforth in Pat. 3,184,554, issued to L. A. Meacham and F. West on May 18,1965, each multifrequency tone comprises a tone from a band ofrelatively high frequencies and a tone from a band of relatively lowfrequencies.

In the multifrequency signal receiver MFR, incoming signals are splitinto two groups by a pair of band elimination filters, each of whichrejects a respective unwanted group of frequencies. Each of the twosignal groups is in turn applied to a respective limiter whose output isa square wave containing the fundamental and odd harmonies of thedominating frequency component of the incoming signal. Each of the twolimiter outputs is in turn applied to a respective group o-f tunedcircuits, each of the tuned circuits being resonant at a preselected oneof the signal frequencies. Outputs from the tuned circuits are used tooperate a pair of relays, one from a group of four low group relays LGlthrough LG4 and one from a group of three high group relays HG1 throughH03, the relays being operated for a period of 45 milliseconds.

The receipt of the report command signal results in the operation of therelays LGI and HG1; the receipt of the repair command signal results inthe operation of the LGI and HG2 relays; and the receipt of the disablecommand signal results in the operation of the relays LGl and HG3. Thereceipt of the pulse tone or the time slot tone results in the operationof the relays LGS and HGB, and the receipt of the track end tone resultsin the operation of the relays LG4 and HG2. A more detailed descriptionof a multifrequency signal receiver of this type is disclosed in Pat.3,076,()59, issued to L. A. Meacham and L. Schenker on Ian. 29, 1963.

In addition to the multifrequency signal receiver MFR, the controlcircuit includes relays that respond directly or indirectly to theoperation of the high group and low group relays HG and LG of themultifrequency receiver. The relays shown in FIG. 5A consist of a noiseguard relay NG, tone guard relay TG, a pulsing relay P, a time slotrelay TS and a track end relay TE. The relays shown in FIG. 5C consistof a pair of control relays C01 and CO2, an alarm report relay AR, arepair relay RP, the start relay ST, the station identification relaySI, a. disable relay DA, a deactivate relay DE, and a report repairrelay RR.

The timing circuit, shown in FIG. 6, includes a primary thermal relayPTH that operates in conjunction with a primary timer relay PTI toprovide primary timing and a secondary thermal relay STH that operatesin conjunction with a secondary timer relay STI to provide secondarytiming. In both primary and secondary timing the relationship betweeneach thermal relay and its associated timer relay is basically the same,and therefore the following description of the relationship between theprimary thermal relay PTH and the primary timer relay PTI will alsoserve to describe the relationship between the secondary thermal relaySTH and the secondary timer relay STI.

The primary thermal relay PTH has a normally closed contact PTH, that isin the energizing path of a timeout relay T01 and a normally opencontact PTI-I2 that is in the energizing path of the primary timer relayPTI. In addition, the primary timer relay PTI has a normally closedcontact PTI, that is in the energizing path of the primary thermal relayPTH, a normally open contact PTI, that is in parallel with the contactPTH, of the thermal relay, and a normally open contact PTI3 that is inthe energizing path of the timeout relay T01.

When the primary thermal relay PTH is energized, a heating period isinitiated, and after the lapse of a period of time during which heataccumulates, the contact PTH, opens and the contact PTHZ closes insequence. The closure of the contact PTH, energizes the primary timerrelay PTI, and the energized timer relay opens the contact PTI, todeenergize the primary thermal relay PTH. In addition, the energizedprimary timer relay PTI closes the contact PTI2 to place a shunt aroundthe closed Contact PTH, and closes the contact PTI3 in the path of thetimeout relay T01. 'Ihe deenergization of the primary thermal relay PTHterminates the heating period and initiates a cooling period andimmediately thereafter the contact PTH, reopens. The primary timer relayPTI, however, remains energized through its own closed contact PTI1. Ifat any time during the cooling period the primary timer relay PTI isdeenergized by the opening of any of the closed contacts in itsenergizing path, the contact PTI1 reopens and maintains the relay in adeenergized state. In addition, the contact PTI, recloses and energizesthe thermal relay PTH. The heating period is thereby reinitiated and thetiming cycle essentially starts anew.

If, on the other hand, the timer relay TI remains energized for theentire cooling period, at the end of the period, the contact PTI-I1recloses and energizes the timeout relay T01 to complete primary timing.Primary timing consists of a heating period of 35 seconds and a coolingperiod of 115 seconds while secondary timing consists of a heatingperiod of l1 seconds and a cooling period of 34 seconds.

'I'he timing circuit further includes timeout relays T02, T03, and T04,and a release relay RL that respond to the completion of primary and/orsecondary timing under certain conditions.

The final circuit of the reporting telephone comprises the repaircircuit, shown in FIG. 7. The repair circuit comprises subscriber ownedequipment that is energized responsive to the repair command signaltransmitted by the supervisory station. The subscriber owned equipmentacts to correct the alarm conditions that have occurred, and if theattempt is successful, the alarm switch AS associated with the correctedalarm conditions reopens. f course, if any alarm condition is notsuccessfully corrected, the alarm switch AS associated therewith remainsclosed.

In the present embodiment the subscribers repair equipment comprises amotor driven actuator that acts to sequentially close all of the circuitbreakers. The circuit breakers that are already closed are unaffected.However, the circuit breakers that were open are thereby closed, and ifthe condition which caused a particular circuit breaker to open does notstill exist, the circuit breaker will remain closed. If, on the otherhand, the condition continues to exist, the circuit breaker willimmediately reopen.

DESCRIPTION OF OPERATION The operation of the telephone reporting setwill now be described and it will be assumed that operation is initiatedby the opening of the circuit breakers 2, 8, and 12. The descriptionwill refer to the gure appearing in parenthesis until a subsequentligure in parenthesis is provided.

Seizure of telephone line The opening of the circuit breakers 2, 8, and12 results in the closing of the alarm switches AS2 (FIG. 2A) and ASS inthe first group and the closing of the alarm switch A512 in the secondgroup. The closed alarm switches AS2 and A88 connect the alarm relay AL1to ground while the closed alarm switch A512 connects the alarm relayAL2 to ground. Both alarm AL1 and AL2 relays are thereby energized andthe contacts thereof operated.

Closed contacts AL1, and AL21 respectively provide slow release paths toground for the alarm relays AL1 and AL2. The path for the alarm relayAL1 is through resistors R1 and R2, the resistor R1 being connected inparallel with a capacitor C1 and the path for the alarm relay AL2 isthrough resistors R3 and R4, the resistor R3 being connected in parallelwith a capacitor C2.

Closed contacts AL1, and AL2, (FIG. 4) cause the reporting set to seizethe ground start telephone line by applying ground to the ringconductor, a path to ground being provided through closed contacts EX1,DA1, ST3,

AL12, AL21, SI1, and DB1, and closed contacts AL13 and AL23 connect thetrack end relay TE to the tip conductor, a path to the tip conductorbeing provided through closed contacts SI1, AL13, AL23, DEg, ST4, DAZ,and EX1. Closed contacts AL1.1 and AL2* (FIG. 3) in combination withclosed contacts DA1, and DB3 energize the motor relay M, and closedcontacts AL15 and AL25 (FIG. 6) in combination with closed contacts TE1,S13, DA4, RR1, T033, and PT I1, energize the primary thermal relay PTHto initiate primary timing.

The remainder of the operated contacts perform no function at this time.Closed contacts ALls and AL2., (FIG. 5C) are in the path to ground ofthe disable relay DA; closed contacts AL1', and AL27 are in theenergizing path of the control relay C02; and open contacts AL1, andAL28 (FIG. 6) are in a path to ground of the release relay RL. Opencontacts AL13 (FIG. 2B), AL11U, AL29, and ALZm, and closed contactsAL111, AL211, and AL212 are in paths to ground of the alarm gate relayAG while closed contact AL111 and open contact AL211 are in the path toground of the group transfer relay GT. Finally, closed contact AL2 (FIG.3) and open contact AL215 are in paths to ground of the head relays H3and H4. It is seen from the above that many of the contacts of the alarmrelays AL1 and AL2 are redundant so that the same result ensues whetherone or both of the relays are energized.

The energized motor relay M closes the contacts M1 and M2 thereof, andthey connect the tape deck motor DM to a source of power and turn it on.The reporting set then waits for the central oliice to respond to theseizure of the ground start telephone line by returning dial tone andapplying ground to the tip conductor.

Failure to receive dial tone If for some reason the central ofiice doesnot return dial tone within approximately seconds of the seizure of thetelephone line, the reporting set drops the telephone line and triesagain. 'This result occurs because primary timing is completed at theend of this period of time, and in the manner set forth in thedescription of the timing circuit (FIG. 6), the open contact PTH1 of theprimary thermal relay PTH recloses and in combination with the closedcontacts PTI3 and T021 energizes the timeout relay T01. Contact T011 isthereby closed and in combination with closed contacts T041, T034, T035,and resistor R5 completes the energization path of the timeout relayT02.

The energization of the timeout relay T02 opens contact T021 todeenergize the timeout relay T01 and closes contact T0211 to combinewith closed contact T041 to energize the timeout relay T03, contact T011reopening to interrupt the previous energizing path of the timeout relayT02. Contact T031 (FIG. 5C) closes and in combination with closedcontact ST1 energizes the station identification relay SI, and contactT032 (FIG. 6) closes and in combination with closed contact ST3 andthermistor TM connects the timeout relay T04 to ground. Finally, contactT033 opens to deenergize the primary timer relay PTI.

The energized station identification relay SI drops the telephone line,contact SI1 (FIG. 4) opening to interrupt the path of ring conductor toground and contact SI1 opening to interrupt the energizing path of thetrack end relay TE through the tip conductor. The latter is necessarysince dial tone may be provided subsequent to the completion of primarytiming, ground being at the same time applied to the tip conductor andenergizing the track end relay TE.

Approximately two seconds later thermistor TM (FIG. 6) conducts and thetimeout relay T04 is energized. Contact T042 closes and shunts thethermistor TM, and contact T041 opens and deenergizes the timeout relaysT02 and T03. Contact T031 (FIG. 5C) thereupon reopens and deenergizesthe station identification relay SL Furthermore, contact T031 (FIG. 6)reopens and deenergizes the timeout relay T04, While contact T033recloses in the energizing paths of the primary timer and thermal relaysPTI and PTH and reinitiates primary timing. The deenergized stationidentification relay recloses contacts SI1 and SI2 (FIG. 4) in the pathsof the ring and tip conductors, respectively, and the telephone line isseized again to make another try .for dial tone.

Receiving of dial tone In the usual case dial tone is provided shortlyafter ground is applied to the ring conductor of the ground starttelephone line, and as indicated above, ground is applied to the tipconductor at the central office at the same time that dial tone isprovided. The track end relay TE is thereupon energized and contact TE1(FIG. 6) opens to interrupt the energization of the primary thermalrelay PTH. In addition, contact TEE (FIG. C) closes and in combinationwith closed contacts C021, DA5, AR1, C011, and ST5, energizes the startrelay ST.

Contacts ST 3 and ST4 (FIG. 4) open and respectively interrupt theterminating paths of the ring and tip conductors, the track end relay TEbeing thereby deenergized, while contacts ST5 and ST, close and incombination with closed contacts S11, P1, and SI5, provide a path acrossthe ring and tip conductors that maintains the seizure of the telephoneline.

Contact ST8 (FIG. 5C) closes and in combination with closed contact RL1provides a second energizing path for the start relay ST, and contactST5 thereafter opens to interrupt the first energizing path. Contact ST1opens in an energizing path of the station identification relay SI,contact ST9 closes in an energizing path of the control relay C01, andcontact ST111 (FIG. 5B) closes to provide power for the multifrequencyreceiver MFR.

Contact ST5 (FIG. 6) opens n the energizing path of the timeout relayT04 and contact ST11 closes in the energizing path of the secondarythermal and timer relays STH and STI. Contact ST12 (FIG. 3) closes toprovide an alternate energizing path for the motor relay M and contactST15 closes to energize the tape deck solenoid DS whereupon the tapecommences to move past the heads HD1 through HD4. In addition, contactST14 closes and in combination with closed contacts AR5 and SI1energizes head relay H1, contact H11 closing to connect the head HD1 tothe preamplifier PA. Finally, contact ST15 closes and energizes thepreamplifier PA, the tape to line amplifier TL, the tape to controlamplifier TC, and the line to control amplifier LC (FIG. 4).

The deenergization of the track end relay TE recloses contact TE1 (FIG.6) in the energizing path of the primary thermal and timer relays PTHand PTI to reinstate primary timing. Also contact TF6 (FIG. 5C) recloseswhich with closed contacts ST9, AR1, SI5, DA5, and C021 energizes thecontrol relay C01. Contact C012 thereupon closes in the energizing pathof the station identification relay SI, and contact C013 closes toprovide in combination with resistor R6 an alternate energization pathfor the control relay CO1.

Dialing of supervisory station With the head HD1 (FIG. 3) connected tothe preamplifier PA, track 1 of the tape (FIG. 3A) is scanned. Therepetitive pulse tones recorded on track 1 are amplied by thepreamplifier PA (FIG. 3) and then coupled by the transformer TR to thetape to control amplifier TC for further amplification. The output ofthe tape to control amplifier TC is connected to the multifrequencyreceiver MFR (FIG. 5B) and each time a pulse tone is received thereby,the low group relay LGS and the high group relay HG3 are brieyenergized.

Contacts LG31 and HG31 (FIG. 5A) respectively close responsive to theenergization of the low and high group relays LG3 and HG3, and these twocontacts in combination with closed contact AR.,l ostensibly serve toenergize the pulsing relay P. However, since the pulse tones occur inrapid succession, the contact LG31 is shorted by closed contact S18 toeliminate the possibility of any time difference in the opening andclosing of the contacts HG31 and LG31 from interfering with theenergization of the pulsing relay P.

The energized pulsing relay P opens contact P1 (FIG. 4) thereof tointerrupt the telephone line and transmit a pulse thereover. iInaddition, the energized pulsing relay P closes contact P2 thereof toplace a resistor R6 across a winding of the relay so as to provide aproper make and break timing of the pulse. Thus each pulse tone recordedon the tape produces onedial pulse. The pulse tones are spaced (FIG. 3A)to provide groups of pulses corresponding to the digits of the telephonenumber of' a supervisory station, which in this embodiment is 464 6079.

Transmission of station identification Immediately after dial pulsing iscompleted, the track end tone recorded on track 1 is scanned by the headHD1 (FIG. 3) and the signal amplified by the preamplifier PA and tape tocontrol amplifier TC and introduced to the multfrequency receiver MFR(FIG. 5B). The multifrequency receiver MFR responds by briey energizinglow group relay LG4 and high group relay HG2. Contacts LG41 and HG21(FIG. 5A) close and in combination with closed contact TG1 briefiyenergize the track end relay TE.

Contact TE1 (FIG. 6) opens in the energizing path of the primary thermalrelay PTH and primary timer relay PT1 and interrupts primary timing.Contact TE3 (FIG. 5C) opens in the energizing path of the control relayCO1, but the relay remains energized through closed contact C015 andresistor R6. 1n addition, contact TR1 closes and completes anenergization path for the station identification relay SI, the pathincluding closed contacts S19, C012, AR1, TE1, DA5, and C021.

Contact S111 (FIG. 4) closes and in combination with closed contactsST6, DA1, and EX1 connects the ring conductor to the hybrid coil HC, andcontact S112 closes and in combination with closed contacts ST1, DA11,and FX1 connects the tip conductor to the hybrid coil. In addition,contacts SI1 and SI5 open to remove the pulsing path from across thetelephone line, and contact S113 opens to remove resistor R7 from theline circuit, resistor R7 performing a balancing function duringdialing.

Contact S13 (FIG. 6) opens and contact S111 closes to remove contactsTE1, A115, and AL25 from the primary timing energization path, andcontact S115 closes in the energizing path of the timeout relay T04.Contact SI1 (FIG. 3) opens, terminating the energization of the headrelay H1 and contact SI15 closes and in combination with closed contactsARS and ST11 energizes head relay H2. Contact H11 opens and contact H21closes and the head HD2 is then connected to the preamplifier PA.

The head HD2 scans track 2 of the tape (FIG. 3A) and the stationidentification message recorded on track 2 is transmitted out on thetelephone line through the tape to line amplifier TL (FIG. 3) and theline circuit (FIG. 4).

Failure to receive report command signal If for some reason thesupervisory station does not answer, such as because the line is busy orthe call is not properly completed by the central otiice, then primarytiming will run its course. In the same manner as described in thesection "Failure to Receive Dial Tone, when primary timing is completed,the timeout relays T01, T02, and T03 (FIG. 6) are energized in sequence,the energization of the timeout relay T02 deenergizing the timeout relayT01.

The energization of the timeout relay T03 opens contact T035 in theprimary timing circuit to terminate primary timing and closes contactT0311 in the secondary timing circuit to initiate secondary timing. Inaddition, it closes contact T032 in the energizing path of the timeoutrelay T04 and contact T039 in the energizing path of the release relayRL.

Then the next time that the track end tone on track 2 (FIG. 3A) isscanned, whereby in the manner hereinbefore described the track endrelay TE is energized, contact TE,A (FIG. 6) briey closes and incombination with closed contact T039 energizes the release relay RL. Inaddition, contact TF briefiy opens in the energizing path of secondarythermal and timing relays STH and STI and resets secondary timing toprevent secondary timeout.

The brief energization of the release relay RL serves to open contactRL, (FIG. 5C) thereof and deenergize the start relay ST. Contacts ST3and ST4 (FIG. 4) thereupon close and contacts ST6 and ST7 open to dropthe telephone line. In addition, contacts STL-.1 and ST1., (FIG. 3) openand respectively deenergize the tape deck solenoid DS to stop the tapeand deenergize the head relay H2 to disconnect the head HD2 from thepreamplifier PA. Contact STR, also opens and deenergizes thepreamplifier PA, the tape to line amplifier TL, the tape to controlamplifier TC, and the line to control amplifier DC, and contact ST1(FIG. SB) opens and deenergizes the multifrequency receiver MFR.Finally, contact ST (FIG. 6) opens and terminates secondary timing, andcontact ST2 closes and in combination with the thermistor TM and closedcontact T032 completes the energizing path of the timeout relay T04.

After approximately two seconds, the thermistor TM T042 closes andshunts the thermistor TM. Contact T041 opens and deenergizes the timeoutrelays T02 and TO3, and contact T043 (FIG. 5C) opens and deenergizes thestation identification relay S1. This results in contacts T032 and S115(FIG. 6) opening to deenergize the timeout relay T04, and contacts S11and S12 (FIG. 4) closing and reseizing the telephone line. Anotherattempt at calling the supervisory station is thereby initiated.

Receiving of report command When the supervisory station answers thecall from the telephone reporting set, the station identificationmessage (FIG. 3A) is heard. The supervisory station is thereby informedof the source of the call, and after this information has been noted,the supervisory station transmits the report command signal by brieflydepressing the digit one button of the Touch-Tone dial associatedtherewith.

The report command signal is received by the line circuit (FIG. 4) andintroduced into the multifrequency receiver MFR (FIG. 5B). Themultifrequency receiver MFR responds to this command signal 'by brieyenergizing the low group relay LG1 and high group relay HG1. Thecontacts LGll (FIG. 5C) and HG1, briey close and in combination withclosed contact AR5 energize the alarm report relay AR, and the contactLG13 and HGlg brieliy close and in combination with closed contact RRZenergize the report repair relay RR.

The energization of the alarm report relay AR closes contact ARB whichin combination with closed contact T043 provides a second energizingpath for the alarm report relay AR, contact ARS opening to interrupt thefirst energizing path. Thus the alarm report relay AL remains energizedwhen the contacts MGll and LG11 reopen. Furthermore, contacts ARI andAR; open and contacts ARq and ARB close in the energizing paths of thecontrol relays C01 and C02, and contact ARD closes in the energizingpath of the repair relay RP.

Contact AR, (FIG. 3) closes and shorts the tape to line amplifier TL,and transmission of the station identification message is thereuponterminated. Contact ARa opens and deenergizes the head relay H2, andcontact AR closes and in combination with closed contacts C022 and AL214energizes the head relay 114. Contact H21 thereupon opens to disconnecthead HD2 from the preamplifier PA, and contact H41 closes to connecthead HD4 to the preamplifier. The scanning of track 2 of the tape (FIG.3A) is thereby terminated and the scanning of track 4 initiated.

Contact ARH (FIG. 2A) closes in the energizing path of the steeringrelay SR, and contact ARH closes in the energizing paths of the steppingchain relays SCI through SC10. In addition, contact ARM (FIG. 2B) closesin the energizing path of the group transfer relay GT, and contact AR15(FIG. 5A) closes in the energizing path of the tone guard relay TG.Finally, contact AR, opens and contact ARN closes to respectively removethe pulsing relay P from and connect the time slot relay TS into anenergizing path responsive to the closure of contacts HG31 and LGsl.

The energization of the report relay RR (FIG. 5C) closes contact RR3which in combination with closed contacts TS1 and RL, provides a secondenergization path for the relay, contact RR2 opening to interrupt thefirst energization path. Thus the report repair relay remains energizedwhen the contacts H613 and LGlg reopen.

Contact RR, (FIG. 6) opens in the energizing path of the primary thermaland timer relays PTH and PTI and terminates primary timing. In addition,contact RR., (FIG. 5) opens and interrupts the transmission path betweenthe telephone line and the multifrequency receiver MFR, terminating thereport command signal input to the multifrequency receiver, and contactRR5 closes and places resistor R8 into the circuit to provide impedancematching.

The scanning of track 4 commences, and the multifrequency receiver MFR(FIG. 5B) responds to each time slot tone by briefly energizing the lowgroup relay LG3 and high group relay HG3. Contacts LG31 and HG31 (FIG.5A) close and in combination with closed contact ARN briey energize thetime slot relay TS. Contact TS2 (FIG. 3) opens and interrupts the shortacross the tape to line amplifier TL. As a result, the time slot tone istransmitted out on the line to he supervisory station during the brieftime that the time slot relay TS is operated. This informs thesupervisory station that the reporting set has responded to the reportcommand signal.

In addition, contact TS1 (FIG. 5C) opens in the energizing path of thereport repair relay RR, and thus the first time slot tone following thereport command signal deenergizes the report repair relay. Contact RRI(FIG. 6) recloses and reinitiates primary timing, and contact RR, (FIG.4) recloses and reconnects the line to control amplifier LC to the inputof the multifrequency receiver MFR, contact RR5 reopening to remove theimpedance matching resistor R8 from the circuit. Further command signalsfrom the supervisory station can then be received by the multifrequencyreceiver MFR.

Finally, contact TS3 (FIG. 5A) closes and energizes the noise guardrelay NG, contact NG, (FIG. 3) closing to place an impedance matchingresistor R9 across the input of the multifrequency receiver MFR andcontact NGZ opening to interrupt the connection of the tape to controlamplifier TC to the multifrequency receiver. Although the contact T83(FIG. 5A) only remains closed for about 40 milliseconds, the noise guardrelay NG remains energized for about 2.8 seconds, the time required todischarge capacitor C3 through resistors R10 and R11. Thus the noiseguard relay NG essentially prevents the recorded messages on the alarmtracks from being transmitted to the multifrequency receiver MFR. Thisprevents the voice announcements on the tape from interfering with anycommand signal that may come from the line.

When the end of track 4 (FIG. 3A) is reached, the track end tone istransmitted to the multifrequency receiver MFR, and in the mannerdescribed above, this results in the brief energization of the track endrelay TE. Contact TE1 (FIG. 5C) closes and in combination with closedcontacts C023, AR, DA5, and C021 completes an energization path for thecontrol relay C01. The control relay C01 is energized, and contactC01.,I closes and in combination with closed contacts ST5, ARB, AL27,and ALL, and control relay C02 completes a second energizing path forthe control relay CO1. The first path, however, shorts the second path,and the control relay C02 is not energized.

The energization of the track end relay TE also closes contact TE, (FIG.2A) and opens contact TF5. Closed contact TE, in combination with closedcontacts ARH and SC11 through SC101 energize the steering relay SR,closing contacts SR1 and SR: and opening contact SRa. Finally, theenergization of the track end relay TE closes contact TE., (FIG. A)which in combination with closed contacts AR15 and TG2 energize the toneguard relay TG. Contact TG3 thereupon closes and in combination withclosed contacts T041 and TS.1 provides an alternate energization pathfor the tone guard relay TG, contact TG2 opening to interrupt the firstpath. In addition, contact TG1 opens and interrupts the energizationpath of the track end relay TE. This prevents the track end relay TEfrom being repetitively energized should, in the manner hereinafterdescribed, there be a switch in the track being scanned and a repetitiveinput of the track end tone result therefrom.

Upon the deenergization of the track end relay TE, contact TE2 (FIG. 5C)reopens to interrupt the first energization path of the control relayC01, and the control relay C01 is then energized through the controlrelay CO2. Contacts C021 and C023 then open in the first energizing pathof the control relay CO1 and contacts C024 and C025 close in a secondenergizing path of the control relay CO2.

In addition, contact C026 (FIG. 3) closes and contact C022 opens torespectively energize the head relay H3 and deenergize the head relayH4. Contact H31 closes and contact H41 opens to respectively connect thehead HDB to and disconnect the head HD4 from the preamplifier PA. Track3 of the tape (FIG. 3A) is thereupon scanned.

Finally, contact C02-1 (FIG. 2B) closes and in cornbination with closedcontacts AL112 and ARM energizes the group transfer relay GT. ContactsGT1 through GTB (FIG. 2A) close and contacts GT11 through GT15 open toconnect the first group of alarm switches AS1 through ASS into anddisconnect the second group of alarm switches AS11 through A818 from thecircuit of the alarm gate relay AG. Also, contact GT,J (FIG, 2B) closesand contact GT opens in the circuit of the alarm gate relay AG.

The deenergization of the track end relay TE also recloses contact TES(FIG. 2A) and reopens contact TEq. The reclosing of the contact TE8provides a second energization path for the steering relay SH throughclosed contacts SR1 SClZ through SC102, T045 and TE5 while the reopeningof contact TE, interrupts the first energization path.

Transmission of alarm report The head HD3 (FIG. 3) then scans the firsttime slot tone on track 3, and in the manner described above thisresults in the brief energization of the time slot relay TS. Contact TS2opens and interrupts the short across the tape to line amplifier TL longenough to permit the time slot tone to be transmitted out on the line tothe supervisory station, but not long enough to permit the recordedmessage following the time slot tone to be transmitted. Contact TS1,(FIG. 5A) closes and energizes the noise guard relay NG, and asdescribed above, it remains energized long enough to block thetransmission of the recorded message following the time slot tone to themultifrequency receiver MFR. Also, contact TS., opens and deenergizesthe tone guard relay TG to reclose the contact TG1 in the energizingpath of the track end relay T2, and contact T55 (FIG. 2A) closes and incombination with closed contacts SC15, SR2, and AR15 energizes thestepping chain relay SCI.

Contact SC13 closes and in combination with closed contacts T and AR13provide an alternate energizing path for the steering relay SR, andcontact SC12 opens to interrupt the previous energizing path. Thus thesteering relay SR remains energized until the time slot relay TS isdeenergized and the contact TS5 reopens. Contact SC14 closes and incombination with closed contacts SCZZ through SC102, T045, and TEEprovides a second energization path for the stepping chain relay SC1,while Contact SC15 opens to interrupt the first energization path. Thusthe stepping chain relay SCI remains energized after the time slot relayTS is deenergized and the contact TS5 reopens.

Contact SC15 opens in an energizing path of the stepping chain relaySC3, and contact SCI? closes in an energizing path of the stepping chainrelay SC2. Futhermore, Contact SCls (FIG. 2B) closes in the energizingpath of the alrm gate relay AG. However, since the alarm switch AS1 isnot closed, the alarm gate relay AG is not energized. Thus, the tape toline amplifier TL (FIG. 3) is shorted out when the head HD3 subsequentlyscans the alarm report recorded in the first time slot (FIG. 3A), andthe message is not transmitted to the supervisory station,

The head HDS thereafter scans the second time slot tone on track 3, andthe time slot relay TS is again briey energized. This time the briefclosure of the contact TS5 serves to energize the stepping chain relaySC2, the energizing path consisting of the closed contacts SC25, SClq,SR3, TS5, and AR13. Contact S023 closes and in combination with closedcontacts S014, TS5, and ARH provides an energizing path for the steppingchain relay SCI that keeps the relay operated until the contact TS5opens shortly thereafter, contact SC22 opening to interrupt the previousenergizing path.

Contact SC24 closes and in combination with closed contacts SC32 throughSC102, T045, and TES provides an energizing path for the stepping chainrelay SC2 that is not interrupted by the opening of the contact TS5,contact SC25 opening to interrupt the previous energizing path. ContactSC28 opens in an energizing path of the stepping chain relay SC4 andcontact SC2, closes in an energizing path of the stepping chain relaySC3. Lastly, contact SC28 opens (FIG. 2B) and contact SC2, closes in theenergizing path of the alarm gate relay AG.

Since the alarm switch AS2 (FIG. 2A) is closed, the alarm gate relay AGis energized, the energizing path comprising in addition to the alarmswitch AS2 closed contacts GT2, SC29 (FIG. 2B), and SC35 through SC105.Contact AG1 (FIG. 3) thereupon opens and interrupts the short across thetape to line amplifier TL. The alarm report recorded in the second timeslot (FIG. 3A) is transmitted out on the line and the supervisorystation is informed that circuit breaker 2 is open.

In the same manner as above, each of the stepping chain relays SC3through SC10 is operated in sequence by the time slot tone recorded inthe associated time slot, and where the energization of a stepping chainrelay results in the energization of the alarm gate relay AG, themessage recorded in the associated time slot is transmitted to thesupervisory station. Thus when the stepping chain relay SCS is energizedresponsive to the time slot tone in the eighth time slot, the alarm gaterelay AG is again energized, the path comprising closed alarm switch ASS(FIG. 2A) and closed contacts GTB, SCSg (FIG. 2B), SC95, and SC108, andthe supervisory station is informed (FIG. 3A) that circuit breaker 8 isopen.

When the end of track 3 is reached, the track end tone is transmitted tothe multifrequency receiver MFR, and the track end relay TE is brieflyenergized responsive thereto. Contact T E1 (FIG. 5C) closes and incombination with closed contacts C025, AR7, DA5, C021, and resistor R12provides an energizing path for the control relay C02 that shorts theprevious energizing path through the control relay CO1. The controlrelay CO1 is therefore deenergized and contact C011 reopens to preventthe relay from being reenergized when the contact TE1 reopens.

As at the end of track 4, the energzation of the track end relay TE alsocloses contact TEG (FIG. A), energizing the tone guard relay TG toprevent a double input of the track end tone, and closes contact TE,(FIG. 2A), energizing the steering relay SR to prepare for anothersequential operation of the stepping chain relay SC1 through SC10.Furthermore, contact TEB opens to deenergize the stepping chain relaySC10.

Upon the deenergization of the track end relay TE, contact TE1 (FIG. 5C)reopens and deenergizes the control relay CO2. Contacts C021 and C023reclose and contacts C021 and C025 reopen in the energizing paths of thecontrol relays C01 and C02. Contact CO2, (FIG. 3) recloses and incombination with closed contacts STM, AR11, and AL2 energizes head relayH4, contact C0211 reopening to deenergize the head relay H3. Contact H41closes and contact H31 opens to respectively connect the head HD4 to anddisconnect the head HDS from the preamplifier PA, and the scanning ofthe tape is switched from track 3 to track 4. Also contact C027 (FIG.2B) opens and deenergizes the group transfer relay GT, contacts GT11through GT 18 (FIG. 2A) reclosing and contacts GT1 through GTE reopeningto respectively connect the second group of alarm switches A811 throughAS 18 into and disconnect the iirst group of alarm switches AS1 throughAS8 from the circuit of alarm gate relay AG.

The deenergization of the track end relay TE further recloses contactTEE and reopens contact TE. As at the end of track 4, the reclosing ofthe contact TEE, provides a second energzation path for the steeringrelay SR through closed contacts SR1, SCI, through SC102, T045, and TEE,and the reopening of contact TE', interrupts the first energzation path.

As the head HD4 scans track 4 of the tape, the stepping chain relays SCIthrough SC10 are operated in sequence in the same manner as describedabove. When the stepping chain relay SC2 is energized, contact SC29closes and in combination with the closed alarm switch A812 and closedcontacts GT12, and SCSs through SC1011 (FIG. 2B) energizes the alarmgate relay AG. The short across the tape to line amplier TL (FIG. 3) isremoved and the message recorded in the twelfth time slot (FIG. 3A) istransmitted out on the telephone line informing the supervisory stationthat circuit breaker 12 is open. In addition, when the stepping chainrelay SC9 is energized, contact SC99 (FIG. 2B) closes and in combinationwith closed contacts SC1011, GTN, AL111, and AL2 again energizes thealarm gate relay AG. This time the short across the tape to lineamplifier TL is removed to permit the message recorded in the nineteenthtime slot (FIG. 3A) to be transmitted out on the telephone line andthereby inform the supervisory station that this is the end of the alarmreport.

In the same manner as described in the section entitled Receiving ofDial Tone," when the end of track 4 is reached, the track end tonecauses the scanning of the tape to be switched from track 4 to track 3and the entire alarm reporting sequence starts all over again. Thus, ifthe supervisory station does nothing, the reporting set will continue torepeat the alarm report until primary timing is completed, at whichpoint the reporting set will drop the telephone line and again call thesupervisory station. The supervisory station can, on the other hand,prevent primary timeout by again transmitting the report command signalor by transmitting the repair command signal.

Receiving of repair command signal If the supervisory station wishes toattempt to correct the alarm conditions that exist at the site of thetelephone reporting set, the repair command signal is transmitted bydepressing the digit 2 button of the Touch-Tone dial of the supervisorystation. The multifrequency receiver MFR (FIG. 5B) responds to thiscommand by briey energizing the low group relay LGI and high group relayHG2. The contacts LG21 and HG22 (FIG. 5C) close and in combination withclosed contact ARD energize the repair relay RP. As a result, contactRP1 (FIG. 7) closes and initiates the operation of the subscribersrepair equipment, which in the present embodiment attempts to close theopen circuit breakers.

The contacts LG21 and H623 (FIG. 5C) also close and energize the reportrepair relay RR. In the same manner as described in the section entitledReceiving of Report Command Signal, the energzation of the report repairrelay terminates primary timing and interrupts the transmission pathbetween the telephone line and the multifrequency receiver MFR toterminate the repair command signal. The report repair relay is thendeenergized by the subsequent time slot tone, and primary timing isreinitiated and the multifrequency receiver MFH reconnected to thetelephone line.

Successful repair of alarm conditions If the alarm conditions aresuccessfully repaired by the equipment of the subscriber, whereby thecircuit breakers 2, 8, and 12 are reclosed, the alarm switches AS2 (FIG.2A), ASS, and AS12 reopen. Then when the capacitor C1 discharges throughthe resistors R1 and R2 the alarm relay ALI. is deenergized and when thecapacitor C2 discharges through the resistors R3 and R4 the alarm relayAL2 is deenergized.

Contacts ALla and AL211 (FIG. 6) reclose in an enenergizing path of therelease relay RL; contacts ALI, (FIG. 2B), AL1111, AL29, and AL210rec1ose and contacts AL111, AL211, and AL212 reopen in the energizingpath of the alarm gate relay AG; and contacts AL11 and AL21 (FIG. 3)reopen in the energizing path of the motor relay M. In addition, contactAL215 recloses in the energizing path of the head relay H3 and contactAL211 reopens in the energizing path of the head relay H4 with theresult that track 3 is thereafter scanned.

The time slot tones continue to operate the stepping chain relays SCIthrough SC10 (FIG. 2A) in sequence, but since none of the alarm switchesAS1 through ASIS are closed, the operation of the stepping chain relaysSCI through SCS does not result in the energzation of the alarm gaterelay AG (FIG. 2B). Furthermore, the operation of the stepping chainrelay S09 and the resultant closure of the contact SC99 also does notresult in the energzation of the alarm gate relay AG. Thus, no alarmmessages and no end of report message is transmitted to the supervisorystation. When, however, the stepping chain relay SC10 is energized andthe contact SC109 closes, it combines with closed contacts ALlg and ALZQto energize the alarm gate relay AG. Contact AG1 (FIG. 3) opens andremoves the short from across the tape to line amplifier TL. The messagerecorded in the tenth time slot is transmitted out on the telephone lineand the supervisory station is informed that all the circuits arereclosed.

Immediately thereafter, the track end tone on track 3 briefly energizesthe track end relay TE resulting, in the manner described above, in thedeenergization of the stepping chain relay SC10 (FIG. 2A) and theenergzation of the steering relay SR and the tone guard relay TG (FIG.5A). In addition, contact TE4 (FIG. 6) closes and in combination withclosed contacts ALlB and ALZB briey energize the release relay RL.Contact RL1 (FIG. 5C) thereupon opens and deenergizes the start relayST.

Contacts ST3 and ST1 (FIG. 4) close and contacts STB and ST7 open todrop the telephone line, and contact ST,

(FIG. B) opens to deenergize the multifrequency receiver MFR. Inaddition, contact ST12 (FIG. 3) opens and deenergizes the motor relay M,contacts M1 and M2 opening to deenergize the tape deck motor DM, andcontact ST13 opens and deenergizes the tape deck solenoid DS. The tapeis thereby halted at the beginning of the tracks recorded thereon.Contact ST14 also opens and deenergizes the head relay H3 to disconnectthe head HD3 from the preamplifier PA, and contact ST opens anddeenergizes the preamplifier PA, the tape to line amplifier TL, the tapeto control amplifier TC, and the line to control amplifier LC (FIG. 4).

Furthermore, contact ST8 (FIG. 5C) opens to prevent the energization ofthe start relay ST upon the subsequent reclosure of the contact RL1, andcontact ST5 closes to allow for energization of the start relay STresponsive to the occurrence of a new alarm condition. Lastly, contactST2 (FIG. 6) closes and in combination with the thermistor TM and closedcontact SI15 completes the energizing path of the timeout relay T04.

After approximately two seconds, the thermistor TM conducts andenergizes the timeout relay T04, contact T042 closing to shunt thethermistor. Contact T045 (FIG. 2A) opens to denergize the steering relaySR and contact T044 (FIG. 5A) opens to deenergize the tone guard relayTG. In addition contact T043 (FIG. 5C) opens to deenergize the stationidentification relay SI and the alarm report relay AR. Contact SI15(FIG. 6) then opens to deenergize the timeout relay T04, and thereporting set is reset to a standby condition ready to respond to theoccurrence of any further alarm condition.

Unsuccessful repair of alarm conditions If the alarm conditions are notcompletely corrected by the repair equipment (FIG. 7) of the subscriber,as for example, circuit breaker 12 being reclosed but circuit breakers 2and 8 remaining open, the supervisory station is informed of this factby the continued transmission of the alarm reports with respect to theremaining open circuit breakers.

Thus alarm switch AS12 opens and deenergizes the alarm relay ALZ andcontacts AL22 and AL210 close and contacts AL211 and AL212 open inenergizing paths of the alarm gate relay AG. In addition, contact AL213closes and in combination with closed contacts AL112 and AR14 energizesthe group transfer relay GT (FIG. 2B), closing contacts GT1 (FIG. 2A)through GTB and opening contacts GT10 through GT12 in energizing pathsof the group transfer relay GT. Finally, contact ALZ, (FIG. 5C) opens inthe energizing path of the control relay C02 and contact AL215 (FIG. 3)closes and contact AL214 opens in the respective energizing paths of thehead relays H4 and H3, the head relay H3 being energized through a pathcomprising closed contacts AL215, C022, AR11, and STM. As a result onlytrack 3 is thereafter scanned and in the manner described in the sectionentitled Transmission of Alarm Report the supervisory station isinformed that circuit breakers 2 and 8 are open.

Furthermore, when the stepping chain relay SC9 is energized, the alarmgate relay AG is energized through a path comprising closed contactsSC108, SC92, GT2, and ALZm. The short across the tape to line amplifierTL is removed bythe opening of the contact AG1 and the message in theninth time slot is transmitted out on the telephone line informing thesupervisory station that the report is completed.

Th-e supervisory station may repeat the repair command signal toreinitiate the operation of the subscribers repair equipment in the hopeof correcting the remaining alarm conditions, but if this is stillunsuccessful the disable command signal is transmitted to deactivate thereporting set.

Receiving of disable command signal The disable command signal istransmitted by the supervisory station by depressing the digit 3 buttonof the Touch-Tone dial of the station. The multifrequency receiver MFR(FIG. 5B) responds to this command by briefly energizing the low grouprelay LGI and the high group relay HG3. The contacts LG13 and HG32 (FIG.5C) close and in combination with closed contacts DAG energize thedisable relay DA. Contact DA, thereupon closes and in combination withclosed contact AL26 or ALIB provides a second energizing path for thedisable relay DA, contact DA1, opening to interrupt the first path. Thedisable relay DA therefore remains energized until the alarm conditionsare corrected and both the alarm relays ALI and ALZ are deenergized.

Contact DAS closes to illuminate a disable lamp DAL, the illuminatedlamp providing a visual indication to any one servicing the telephonereporting set that the set has been disabled by the supervisory station.Contact DA5 opens in an energizing path of the control relays C01 andC02, and contact DAQ closes in an energizing path of the deactivaterelay DE. Contact DA., (FIG. 6) opens and terminates primary timing,while contact DA1.) closes and in combination with closed contact STI1,TE5, and ST11 energizes the secondary thermal relay STH to initiatesecondary timing. Contact DA11 closes in the energizing path of therelease relay RL, and contact DA3 (FIG. 3) opens in the energizing pathof the motor relay M. Finally, contacts DA1 and DA2 (FIG. 4)respectively open in the paths of the ring and tip conductors, and thetelephone line is dropped.

When the end of the track is reached, the track end tone briey energizesthe track end relay TE which in turn deenergizes the stepping relaySClI] (FIG. 2A) and energizes the steering relay SR and the tone guardrelay TG (FIG. 5A). Furthermore, contact TE., (FIG. 6) closes and incombination with closed contact DA11 briefly energizes the release relayRL. Contact RL1 (FIG. 5C) is thereby opened and the start relay ST isdeenergized.

Contact ST12 (FIG. 3) opens and deenergizes the motor relay M, contactsM1 and M2 opening to deenergize the tape deck motor DM, and contact SD12opens and deenergizes the tape deck solenoid DS. The tape is therebyhalted at the beginning of the tracks recorded thereon. Contact STM alsoopens and deenergizes the energized head relay H3 or H4 to disconnect itfrom the preamplifier PA, and contact ST15 opens and deenergizes thepreamplifier PA, the tape to line amplifier TL, the tape to controlamplifier TC, and the line to control amplifier LC (FIG. 4).

Contact ST10 (FIG. 5B) opens to deenergize the multifrequency receiverMFR, and contact STB (FIG. 5C) opens to prevent the energization of thestart relay ST upon the subsequent reclosure of the contact RL1. ContactST11 (FIG. 6) opens and terminates secondary timing, while contact ST2closes and in combination with thermistor TM and closed contact SI15completes the energizing path for the timeout relay T04.

After approximately two seconds, the thermistor TM conducts andenergizes the timeout relay T04, Contact T042 closing to shunt thethermistor. Contact T045 (FIG. 2A) opens to deenergize the steeringrelay SR, and contact T044 (FIG. 5A) opens to deenergize the tone guardrelay TG. In addition, contact T043 (FIG. 5C) opens to deenergize thestation identification relay SI and the alarm report relay AR.

The telephone reporting set is at this point in a disabled conditionunable to respond to the occurrence of any new alarm condition. This isbecause the open contacts DA1 and DA2 (FIG. 4) prevent the telephoneline from being seized, and open contact DA3 (FIG. 3) prevents the motorrelay M from being energized. When the existing alarm conditions arecorrected, the alarm relays ALI and AL2 (FIG. 2A) will both bedeenergized, and the contacts Alle and AL26 (FIG. 5C) will both be openwhereby the disable relay DA will be deenergized. Contacts DA1, DA2, andDA2 will all close and the reporting set will then be reset to a standbycondition.

Breakdown of reporting set After the opening of the reporting set hasbeen initiated by the occurrence of an alarm condition, should themagnetic tape break or some other failure occur that prevents thescanning of the tape, the reporting set deactivates itself.

Thus, if the failure occurs prior to the transmission of stationidentification, primary timeout occurs in the manner set forth in thedescription of the timing circuit (FIG. 6) because of no track endsignal. If, on the other hand, the failure occurs during or after thetransmission of station identification, primary timeout occurs becauseof no report or repair command signals. These command signals will beabsent because if the failure occurs before the supervisory stationanswers, the supervisory station will not be aware that the call hasbeen originated by a telephone reporting set, and if the failure occursafter the supervisory station answers, the supervisory station willappreciate that a failure of the aforementioned nature has occurred.

At the completion of primary timing, the open contact PTH1 closes and incombination with the closed contacts PT13 and T021 energizes the timeoutrelay T01. Contact T011 is thereby closed and in combination with closedcontacts T041, T034. T035, and resistor R completes the energizationpath of the timeout relay T02.

The energized relay T02 opens contact T021 to deenergize the timeoutrelay T01 and close contact T022 to combine with closed contact T041 toenergize the timeout relay T03, contact T011 reopening to interrupt theprevious energizing path of the timeout relay T02. Contacts T031 andT03, close and contacts T03.1 and T035 open to prepare anotherenergization path for the timeout relay T03. Contact T033 opens anddeenergizes the primary timer relay PTl and contact T0311 closes and incombination with close contacts STI1, TF5, and ST11 energizes thesecondary thermal relay STH. Further, contact T032 closes in theenergizing path of the timeout relay T04, and contact T0311] (FIG. 5C)closes in an energizing path of the deactivate relay DE.

After approximatel 1l seconds, Contact STH1 (FIG. 6) opens in anenergization path of the timeout relay T01, and contact STHZ closes andin combination with closed contacts T038, TE5, and ST11 energizes thesecondary timer relay ST1. Contact ST12 thereupon closes to shunt theContact STH and contact ST1 opens to deenergize the secondary thermalrelay STH. In addition, contact ST13 closes in an energization path ofthe timeout relay T01.

Approximately 34 seconds later, the contacts STH1 recloses and incombination with closed contact STI3 energizes the timeout relay T01.Contacts T01, closes and in combination with closed contacts T0311 andT03, provides an energizing path for the timeout relay TO3 that shortsthe timeout relay T02. The timeout relay T02 is thereby deenergized, andcontact T022 opens to interrupt its energizing path. Furthermore,contact T012 (FIG. 5C) closes in combination with closed contacts T0311,and DB5 energizes the deactivate relay DE.

Contact DE., closes and in combination with a closed DE key provides analternate energization path for the deactivate relay DE, contacts DB5opening to interrupt the previous path. Contact DES (FIG. 4) closes andilluminates a deactivate lamp DEL to provide a visual indication toanyone servicing the telephone reporting set that the set hasdeactivated itself. Contacts DB1 and D132 open and if the failure hasoccurred prior to the station identification announcement, the telephoneline is dropped at this point. Contact DB3 (FIG. 3) opens in oneenergizing path of the motor relay M, and Contact DB1 (FIG. 6) closesand in combination with capacitor C4 and parallel with resistor R13briefly energizes the release relay RL. Contact RL1 (FIG. 5C) thereuponopens and deenergizes the start relay ST.

In the same manner as described in the section entitled SuccessfulRepair of Alarm Conditions," the deenergization of the start relay STresults in the dropping of the telephone line (FIG. 4) if it has notbeen previously dropped and in the deenergization of the multifrequencyreceiver MFR (FIG. 5B), the motor relay M (FIG. 6), the tape deck motorDM, the tape deck solenoid DS, the preamplifier PA, the tape to lineamplifier TL, the tape to control amplifier TC, and the line to controlamplifier LC (FIG. 4). In addition, the deenergization of the start STopens contact ST11 (FIG. 6) to deenergize the secondary timer relay ST1and closes contact ST2 to energize the timeout relay T04.

The energized timeout relay T04 acts to deenergize the stationidentification relay SI (FIG. 5C) and alarm report relay AR if one orboth of these relays have been previously energized. Thereafter, thetimeout relay T04 (FIG. 6) is itself deenergized by the deenergizationof the timeout relay TO3 and the reopening of contact T032, the timeoutrelay T03 being deenergized by the deenergization of the timeout relayT01 and the reopening of contact T011, and the timeout relay T01 beingdeenergized by the deenergization of the secondary timer relay STI andthe reopening of contact STI3. The reporting set is then in adeactivated condition with only the deactivate relay DE (FIG. 5C)remaining energized. After the reporting set is repaired, the deactivaterelay DE is manually deenergized by the opening of the DE key.

Although a specific embodiment of the invention has been shown anddescribed, it will be understood that it is but illustrative and thatvarious modifications may be made therein without departing from thescope and spirit of this invention as defined in the appended claims.

We claim:

1. A telephone reporting set comprising:

means responsive to the occurrence of a predetermined condition forseizing a telephone line;

means responsive to a [dial tone] signal indicating that the central oceis ready to receive calling signals for calling a preselected telephonenumber;

message transmitting means;

means responsive to the completion of the calling of the preselectedtelephone number for causing the message transmitting means to transmita message identifying the telephone reporting set making the call; and

means responsive to a signal from the called station while the messagetransmitting means is identifying the telephone reporting set forcausing the message transmitting means to transmit a message indicatingthe occurrence of the predetermined conditions.

2. A telephone reporting set as in claim 1 further including meansresponsive to the expiration of a particular period of time followingthe seizure of the telephone line during which no [dial tone] signalindicating that the central oce is ready to receive calling signals isreceived for dropping the telephone line and then reseizing it a shorttime later.

3. A telephone reporting set comprising:

means responsive to the occurrence of one or more of a multiple of alarmconditions for seizing atelcphone line;

means for thereafter calling a supervisory station;

message transmitting means;

means operative subsequent to the calling of the supervisory station forcausing the message transmitting means to transmit a message identifyingthe telephone reporting set making the call; and

means responsive to a signal from the supervisory station while themessage transmitting means is identifying the telephone reporting setfor causing the message transmitting means to transmit a messageidentifying which of the multiple alarm conditions have occurred.

4. A telephone reporting set as in claim 3 further in- 21 cluding meansresponsive to a signal from the supervisory station while the messagetransmitting means is identifying which of the multiple alarm conditionshave occurred for initiating corrective action with respect to the alarmconditions.

5. A telephone reporting set as in claim 4 wherein the messagetranmtting means thereafter transmits a message indicating whether thecorrective action was successful and if not successful indicating whichalarm conditions still continue to exist.

6. A telephone reporting set as in claim 4 further including means fordropping the telephone line and resetting the reporting set to a standbycondition if the corrective action was successful.

7. A telephone reporting set as in claim 3 further including meansresponsive to a particular signal from the supervisory station fordropping the telephone line and disabling the reporting set until thealarm conditions are corrected.

8. A telephone reporting set comprising:

means responsive to the occurrence of a predetermined condition forseizing a telephone line;

means for thereafter calling a preselected telephone number to establisha communication path with a particular station;

means operative subsequent to the calling of the preselected telephonenumber for transmitting to the called station a message indicating theoccurrence of the predetermined condition; and

means responsive to a signal from the called station while the messageindicating the occurrence of the predetermined condition is beingtransmitted for initiating a particular action with respect to thepredetermined condition.

9. A telephone reporting set comprising:

means responsive to the occurrence of a predetermined condition forseizing a telephone line;

means for thereafter calling a preselected telephone number;

message transmitting means;

means operative subsequent to the completion of the calling of thepreselected telephone number for causing the message transmitting meansto transmit a message identifying the telephone reporting set making thecall; and

means responsive to a signal from the called station while the messagetransmitting means is identifying the telephone reporting set forcausing the message transmitting means to transmit a message indicatingthe occurrence of the predetermined condition.

10. A telephone reporting set as in claim 9 further including meansresponsive to a signal from the called station while the messagetransmitting means is indicating the occurrence of the predeterminedcondition for initilll 22 ating a particular action with respect to thepredetermined condition.

11. A telephone reporting set as in claim 10 wherein the messagetransmitting means thereafter provides an indication of whether theaction initiated was successful.

12. A telephone reporting set as in claim 10 further including means fordropping the telephone line responsive to termination of thepredetermined condition.

13. An automatic alarm signaling system comprising.'

a sensor for detecting the occurrence of an emergency event,

means responsive to actuation of the sensor for connecting the alarmsignaling system to a telephone line.

a generator for producing telephone station calling signals,

a generator for producing emergency message signals,

means responsive to the reception of a signal indicating that thecentral oice is ready to receive calling signals for causing telephonestation calling signals to be transmitted into the telephone line,

means responsive to a first signal transmitted by the called station,for actuating the emergency message signal generator, and

disconnecting means responsive to a second signal transmitted by thecalled station to disconnect the alarm signaling system from thetelephone line.

14. An automatic alarm system according to claim 13, further including:

a latch in the disconnecting means, the latclz acting to prevent thealarm system from again being connected to the telephone line until tiledisconnecting means is unlatched.

References Cited The following references, cited by the Examiner, are ofrecord in the patented file of this patent or the original patent.

UNITED STATES PATENTS 2,717,986 9/1955 Dimmer 179-2 3,049,592 8/1962Waldman 179-2 3,098,123 7/1963 Stonor 179-2 3,207,849 9/1965 Andrews179-5 3,287,500 11/1966 Moore 179-5 3,383,467 5/1968 New et al 179-23,427,402 2/ 1969 Stokes 179-5 KATHLEEN H. CLAFFY, Primary Examiner D.L. STEWART, Assistant Examiner U.S. Cl. X.R. 179-2 A

